Let's say that I have 2 projects with that use the same images, stored in folder: /assets/pictures/
Is there a way I can share those images, without including them in both projects?
You can create a Library Project, and place the drawables, assets, there (see Managing Projects in the Android documentation
Then reference this Library Project from your Application Projects.
Make sure you're using Gradle/Android Studio though. Ant doesn't support assets in Library Projects (or at least didn't -- this might've changed).